Composite telephony and telegraphy.



YATENTED SEPT. 13

a; 0. RUSH. COMPOSITE TELEPHONY AND TELT ".GRAPHY.

APPLICATION FILED JAR. 13, 1903.

RUGH, OF UHlCAG iLLlNOlS, ASSIGNOR- TO lVliS'lEltN s GRAPHQNE COMPAJW', OE ORA'lTlOll OF SOUTH .DAEGQA.

MINNEAPOLIS, MINNESOTA, A i

@Ql'lilP-QSETE TELEPHGEQZY TEuEGRllP'tlYn its senses.

Specification of Letters Patent,

Patented Sept. 18,

Application filed January 13, 1903. Serial No. 188,865

lo all whom it may concern:

Be it liIlOW that l, HARRY 0. Russ, c

scribed eut has been made to prevent the teleg a currents from oper ating the telephone-receivers that might be si1nultaneouslyi use with the telegraphic instruments cuit. ct been as siiectrrely acconipl M ed iii: in accordance with my invention provide associated with the telephoneubstation apparatus whereby the telegraphic urrents that may find their Way to the tele phone connections will be diverted from the telephones. To this end I provide a by-path for diverting telegraphic currents from each telephone-receiver, this by-path being of low ohmic r tcnce and high impedance. The path is n Jtilfi of low ohmic resistance, so that telegraphic currents may readily pass through 5 the same, the impedance in this path not be ing material obstruction to such currents; but 't is made of high impedance, so that the iency voice-currents Will be forced use receiver. This lay-path not only shunts the telephone receiver, but also desirably shunts the induction-coil or a part thereof, so that the telegraphic currents will neither directly nor indirectly influence the telephone apparatus. It is obvious, how ever, that the path of impedance may be associated with circuits wherein the association of the "'eceiver with the transmission-line is purel: fictive, as 18 Well understood by So far as i sin aware this 3 while the primaries are adapted for metallic connection Wit-lithe telephone-linens in co: inch battery practice. Where-the invention is in practice with a system of the latter class,

ohmic resistance containing high impedance, performing the same functions as those llltlb erto s pacified.

and telegraph line may have signals conveyed thereto without interfering With tcle graphic instruments upon the line, a generetor of signelirfgcurrent is adapted for associ* ation with the telephone-line that will prowhich the telegraph instruments will not re spend, but to which a signahrcceiver proption with the transmission-line and whos primery'is adapted for inclusion with a i not, this primary winding being included in of ordinary make-and-break or single-stroke I cells.

ear Without being annoyed by t e outgoing closes the local circuit opens the circui. taining the subscribers telephone i ment. The signal-receiver that l p employ sit the substations has a cirru normally closed, preferably thr, agency of a s ring desirably forms either 'in Whole or in part, the clos: containing a. relay or operating clec net of the signal. A signal that is very suitable for the purpose is a single stroke bell whose hammer is normally mchltained against the gong to open an 'alternetive path containing the bell-magnet that includes it back contact of the bell-magnet armature, as in ordinary make-and-break circuits. The aforesaid s ring is caused to open the circuit normally closed thereby through the agency the primary coil is shunted by a path of low In order that a telephone station connected with a composite telephone erly constructed and arranged'will respond. at a telephone-station; The transmittinggenerator preferably comprises an induction-Q coil Whose secondary is adapted for connec- '75 circuit with. the armature and back contact of r the armature 1n the manner of the magnets in order that the user of a telephone may signal While he has his receiver a plied .to his.

sigrmling-current, I provide a key Which as it of an electromagnet constitutin the signal-o vreceiver proper, through whlc mcolnmg duce currents of 'very high frequency, to

circuit with the battery, the primary coil also desirably constituting the windmg of a mag iOO 5 to the spring or iron portion thereof, w rich in cooperation with the core of the electromag net alternately polarized by the incoming slgnallng-currents Wlll effect a vibration of the'spring that wil maintain 'the same in open circuit. I believe it to be novel with me'to thus maintain arelay or bell-operating electromagnet in a closed circuit containing a circuitbreaker (asthe aforesaid spring) to cause the attraction of the armature of the said relay to maintain open another circuit, Whichwould effect its operation.

I will explain my invention more fully by reference to the accompanying drawings, in Which Figure 1 illustrates a composite telephone and telegraph circuit equipped in accordance with my invention. Fig. 2 is aview of a 'modified circuit arrangement of apparatus at a telephone-station of such a composite system.

Like parts'are indicated by similarcharacters ofrefcrence in both views.

Referring first more particularly to Fig. 1, I have illustrated the transmissiondine a, that may be employed for connecting telephone-stations and telegraph-stations, there being indicated tWdtelegraph-stations l) b at the extreme ends "of the line and two telephone-stations c c at intermediate points, of the line. I do not wish to be limited, however, to such relative arrangement of stations. As the tele raph instruments illustrated Will be readily understood by those skilled in the art, I do not deem a description thereof to be essential. I have indicated impedance devices (Z d to permit the passage of telegraphic current between the telegraphstations and prevent the passa e of VO1G6- currents through the telegrap' stations. Where each telephone-station is connected with a transmission-line, there is desirably included in the branch extending to the telephone-station apparatus a condenser e for the purpose of preventing the passage, or rather reducing the passage, of telegraphic currents through the telephone apparatus. At each telephone-station there is contained well-known telephonic apparatusnamely, a receiver f, atransmitter-g, and an induction-coil containing a secondary h and a p ri mary is off its hook, the branch in, extending to the transmission-line, is closed for the purpose of enabling conversationbetween the stations.

6 5 the-system shown in Fig; 1, there 1s included to be induced in the secondary coil,

When the receiver at each station It has been found in practice that thecon-1 in shunt the receiver and the secondary coil an agency serving to prevent the transmission of telegraphic currents through the receiver.

This agency desirably is in the form of an im' edance-coil Z, which may, if desired, be adjustahie by having its core rotatably mpunted upon an arm, as indicated. This unped'ance-coilis preferably of quite low ohmic resistance, so as to afford an easy path for the comparatively straight currents emanating from the telegraph-stations, but of high im pedance voice-currents.

Referring to Fig. 2, in order to prevent the teiegraphic currents from assing through to obstruct the highfrequency the primary coil, which Wou (1 cause currents Iprovidej an impedance device 1. This primary coil 1',

is shunted by the impedance device Z, which hasthe same genera nature as described in connection with Fig. 1.

At each statioi'i.

there is provided a SignaLreceiVer, that is normaliy included in circuit with the trans- IXllSSiOIh'llUfi through the agency of the telephone switch-hook m at the corresponding station, and a spring '17,, thrust by the switchhook against its normal contact when the receiv'er is upon its switchhook. The element thet receives the incoming signal1ng-current is a relay or s gnal-resolver 0, (shown grounded,) Whose core-is of soft iron and Which-acts also as a. conductive connection in the local circuit 99, as will be presently set forth. This core has at one end a contact, preferably platinum, against which a spring 11 bears by its own tension. This spring q is madcof iron, at least Where it is opposed to the mag-' net, and constitutes a part of the circuit p.

The electromagnet o is provided with a'per--. manent magnet 1", so that when incoming,

high-frequency signaling currents are passed y through the magneto the spring 9 is forced away from physical contact with. the core of the magnet 0 to open the circuit fp, with the results to be hereinafter set o'r Lh- Thepermanent magnet r is desirably provided- -with asoft-iron screws, that determines the reluctance of the magnetic'circuit afi'ordedfl by the permanent magnet and the core ofthe; e ectromagnet. The circuit p contains a source of current, as a battery 25, andalso' an electromagnet or relay c; In the present instance the relay it has its armature rovided with a hammer that-is adap'te ,to strike against a gong u, which hammer is desirably normally held against the gong. as

the electromagnet 'uis normally energized. T

When an incoming signaling-currentof sufiicientl-y high frequency 'is' passed through the ,M N

electroma net 0, the circuit p is opened by.-

the removal of spring g from its contact, as

stated, whereupon a second circuit containing the battery tis closed by Way ofthe back contact of the armature 'in the manner of direct-current make-and-break bells. The

transmitter of signaling-current is desirably in addi ion to closing thepriinary local circuit also connects the secondary 1 .10 said primary with the transmission line. The primary high frequency may 'hne which is not capable of operatively afconstitutes also the energizing winding of an ere romsgnet whose armature 2: when not attracted closest-he priinziryc uit (assuming the key 1 to be depressed) and while attracted. serves to open the said. circuit some iv-shat in the manner of the si nel-causing device it. In this we current of extremely be impressed upon the iec'tin the telegr n ailments also conn with then impedance-coils d acting to 1 event the transmission of these high'ireq ncy OlJ.l"1iiuS= When the telephone instruments ere in use, the receivers are removed from their SWlt-GlkllOOliS, WllBIG by the signaling-receivers c are cut out of circuit and the transmitters g and the receivers are out into circuit. twill be seen that a subscriber may signal whether his telephone is on or ofi' its hook Without un-- pleasant noises in his receiver, which result is accomplished by connect ms of the lcey 0 which serves to cut out the cmresponding recciverwhen it is actuated. Each *itchhook is preferably oi t e construction illustrated, having a plung '10, adapted for in sertion between the springs a and a; to open the circuits containing the telephone instruments f and g and to close the circuits con taining the 'signarl receiver. These springs as and x by their own resiliency close upon their alternate contacts when the receivers are removed from their switch-hooks to cut out thesignal-receivers and include the tele phone in CZUIIlBDlZS in circuit Some suitable form of lightningorrester current-pro tcctor g, is'desirably contained in each tele phone branch.

The telegraphic currents that may pass through the telephone brsncheslhave their characteristics somewhat modified in their transmission, as by jhu l" condensers in the telephone branches, so that all such currents may not pass through. the inductive shunts about the telephone zipper. is In. such event such inductive shunts serve to smooth the current to prevent violent clicks in the telephone-receivers.

.l have used the pln'z ise herein of low ohmic resistance, meaning that the ohmic resistance low as con'ipsred with the portion of the telephone conouctor that is shunted by the some, so the telegraphcurrents will select is part of low resistance rather than pass through the telephonic instruments.

It is obvious that changes may readily be made from the system herein shown Without departing from the spirit of my invention,

and I do not, therefore, wish to be limited to the: precise system, and. details thereof illus trntedw Having. thus described invention, I

cl mini as new a and desire to .secure by Letters "5: .IF 1 2' ins composite telephone and telegraph. system, the combination with a transmission-line, oftelegrsph-stetions united thereby, telephonestations which the said transmissiondiue serves to-connect in connecting branches from the said transmissiondineand means for shunting the telegraph-currents from the telephone instrument at the substations, the said means comprising an impedance device of low ohmic resistance in a shunt or by-path about the corresponding receiver end secondary coil, substantially as described;

2. In a composite telephone and telegraph system, the combination with a transmission-line, of telegraplkstations united there by, telephone-stations which the said transmission-line serves to connect in connecting branches from the said transmission-line and means for shunting the telegraph-currents from the telephone instruments at the substations, said means being in the form of an impedance device of low ohmic resistance'in shunt of one of the windings oi the transmitter-induction .coil, substantially as described.

3. In a composite telephone and telegraph system, the combination with a transmission-line, of telegraph-stations unitel there by, telephone-stations which the said transn1issionline serves to connect, connecting branches serving to unite said telephone-stations with said transmission-line, condensers in said connecting branches between the telephone stat-ions and the transmission line and instrumentalities connected with said branches between the telephone-stations and the condensers, snid instrunientslities serving to shunt telegraph currents leeklng through the condensers and themselves not materially deflecting telephone-currents passing between teleplionestations and the trans mission-line.

at. In it composite telephone and telegraph system, the combination with s trzinsn'iission-line, of teleg spill-stations united there by, telephonestations which said trans mission-line serves to connect, connecting branches serving to unite said telephone-stetions with said transmission-line and instruinentalitics at the telephone-stetions serving to shunt telegraph-cu: 'llJS leaking toward the telephone sppar tus and tl'ieniselves not materially deflecting telephone-culrents passing between telephone-stations end the trsnsmission-line.

5. In a composite telephone and telegraph system, the combination with 's transmission-line, of telegraphstations united there- 4 by, *telephone stations; which the said" trans m ssion-lineserves to connect, connecting branches serving tounite said telephone-sta tions vwith said transmission-line, condensers in said connecting branches between the telephonestations and thetransmission line and instrumentalities connected with said branches between the telephone-stations and. the condensers, said instrumentalities serV- ing to shunt tel'egraphcurrents leaking' through the condensers and themselves not materially deflecting telephone-currents passing between telephone-stations and the trans-- mission-line andincluding a current carrying Winding of high impedance and low ohmic'resistancel L 6. In a composite telephone and telegraph s stem, the combination with a transmis- 20 sion-line, of telegraph-stations united thereby, telephone-stations which the said trans- I missioneline serves to connect, connecting branches serving to unite said telephone-stations with said transmission-line and instrumentalities-at the telephone-stations serving Witnesses: GEORGE L.- OBAGG, IRVING MACDONALD.

to shunt telegraph-currentsleaking towar 

